Doc has hidden his lab somewhere in Seamus' apartment and you must find it to progress. To do this, you must find the entrance to the lab as well as the password to open the door. Here is where to find the door and password to the secret lab in Stray.
How to find the door for the secret lab in Stray
To find the door to the secret lab in Stray, you must search Seamus' apartment for clues. Go along the walls and knock off all the hanging pictures. This will reveal a digicode as well as clues to decipher the password.
How to find the password for the secret lab in Stray
To find the password for the secret lab in Stray you must use the clocks. Look at the hour hands of each clock to figure out the code. This will tell you the code is 2511. Enter this into the digicode to reveal and open the door to the secret lab in Seamus' apartment.
Where to take the broken tracker in Stray
Now that you have discovered the secret lab, Seamus will find Doc's tracker. This can be used to find his location, but the tracker is broken and must be repaired. Take the tracker to Elliot in Elliot's Programming. The robot will reveal the tracker can be fixed but needs a blanket to stop his trembling fingers.
Where to find the blanket/poncho in Stray
To get Elliot to stop trembling, you must find the poncho and give it to him. This is the blanket and can be acquired by trading the Electrical Cable to Grandma in her shop. Likewise, the Electrical Cable can be acquired from Barterman by trading the Super Spirit Detergent found in Kosmo's Laundry. With this item, return to Elliot to fix the tracker and rejoin Seamus on the quest to find Doc.